HC-SCR

HC-SCR is a technology designed to reduce primarily Nitrogen Oxides (NOx) emissions from internal combustion engines (specially diesel engines). Unlike urea-water solution injection in a conventional SCR system, hydrocarbons is injected in the exhaust stream as a reducing agent in the HC-SCR system. HC-SCR is becoming increasingly interesting in the context of meeting stringent environmental standards, such as Euro 7, BS7, etc.

How HC-SCR Works

HC-SCR systems primarily focus on reducing unburned hydrocarbons in the engine's exhaust. The process occurs over a specially designed catalyst, typically containing precious metals like platinum or palladium. The catalyst facilitates a chemical reaction between the hydrocarbons and NOx emissions breaking down NOx into nitrogen and water vapor. Partial oxidation of the hydrocarbons improves the reaction efficiency.

Advantages of HC-SCR
  • Compatibility with Diesel and Gasoline Engines:Although HC-SCR was initially more commonly used in diesel engine applications, advancements in catalyst technology have made it applicable to gasoline engines as well.
  • Cost-Effectiveness:Compared to other emission reduction technologies, HC-SCR systems are generally cost-effective to implement and maintain, especially when considering the long-term environmental benefits.
Applications of HC-SCR
  • Automotive Industry: The primary application of HC-SCR is in passenger vehicles, trucks, and buses, where it is used to meet stringent emission regulations. In commercial trucks and industrial applications, HC-SCR is a key technology to meet environmental regulations that mandate reduced NOx and HC emissions.
  • Off-Road Vehicles: HC-SCR is also increasingly used in off-road and construction vehicles, which are subject to similar environmental regulations.
Future of HC-SCR
  • As emission standards become more stringent, HC-SCR systems are likely to evolve further. New developments in catalyst materials, reductant technology, and system integration could enhance the efficiency, cost-effectiveness, and ease of use of HC-SCR systems, enabling automotive industry to meet even more demanding environmental targets.
  • HC-SCR offers a sustainable pathway for reducing NOx emissions, especially in applications where traditional Urea base SCR systems may not be feasible
  • Additionally, HC-SCR may also find applications in hybrid vehicles where a combination of internal combustion and electric propulsion requires advanced emissions treatment.